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@article{1846937,
author = {Koç, Seliz and Yontan, Talar and Bilir, Selçuk and Canbay, Remziye and Ak, Tansel and Banks, Timothy and Ak, Serap and Paunzen, Ernst},
article_number = {4},
doi = {http://dx.doi.org/10.3847/1538-3881/ac58a0},
keywords = {NGC 1664; open clusters; NGC 6939; CCD UBV},
language = {eng},
issn = {0004-6256},
journal = {The Astronomical Journal},
title = {A Photometric and Astrometric Study of the Open Clusters NGC 1664 and NGC 6939},
url = {https://iopscience.iop.org/article/10.3847/1538-3881/ac58a0},
volume = {163},
year = {2022}
}
TY - JOUR
ID - 1846937
AU - Koç, Seliz - Yontan, Talar - Bilir, Selçuk - Canbay, Remziye - Ak, Tansel - Banks, Timothy - Ak, Serap - Paunzen, Ernst
PY - 2022
TI - A Photometric and Astrometric Study of the Open Clusters NGC 1664 and NGC 6939
JF - The Astronomical Journal
VL - 163
IS - 4
SP - 1-21
EP - 1-21
PB - IOP Publishing Ltd.
SN - 00046256
KW - NGC 1664
KW - open clusters
KW - NGC 6939
KW - CCD UBV
UR - https://iopscience.iop.org/article/10.3847/1538-3881/ac58a0
N2 - This study calculated astrophysical parameters, as well as kinematic and galactic orbital parameters, of the open clusters NGC 1664 and NGC 6939. The work is based on CCD ultraviolet, blue, and visual (UBV) and Gaia photometric and astrometric data from ground- and space-based observations. Considering Gaia Early Data Release 3 (EDR3) astrometric data, we determined membership probabilities of stars located in both of the clusters. We used two-color diagrams to determine the E(B − V) color excesses for NGC 1664 and NGC 6939 as 0.190 ± 0.018 and 0.380 ± 0.025 mag, respectively. Photometric metallicities for the two clusters were estimated as [Fe/H] = −0.10 ± 0.02 dex for NGC 1664 and as [Fe/H] = −0.06 ± 0.01 dex for NGC 6939. Using the reddening and metallicity calculated in the study, we obtained distance moduli and ages of the clusters by fitting parsec isochrones to the color–magnitude diagrams based on the most likely member stars. Isochrone fitting distances are 1289 ± 47 pc and 1716 ± 87 pc, which coincide with ages of 675 ± 50 Myr and 1.5 ± 0.2 Gyr for NGC 1664 and NGC 6939, respectively. We also derived the distances to the clusters using Gaia trigonometric parallaxes and compared these estimates with the literature. We concluded that the results are in good agreement with those given by the current study. Present-day mass function slopes were calculated as Γ = −1.22 ± 0.33 and Γ = −1.18 ± 0.21 for NGC 1664 and NGC 6939, respectively, which are compatible with the Salpeter slope. Analyzes showed that both of clusters are dynamically relaxed. The kinematic and dynamic orbital parameters of the clusters were calculated, indicating that the birthplaces of the clusters are outside the solar circle.
ER -
KO$\backslash$C C, Seliz, Talar YONTAN, Sel$\backslash$c cuk BILIR, Remziye CANBAY, Tansel AK, Timothy BANKS, Serap AK a Ernst PAUNZEN. A Photometric and Astrometric Study of the Open Clusters NGC 1664 and NGC 6939. \textit{The Astronomical Journal}. IOP Publishing Ltd., 2022, roč.~163, č.~4, s.~1-21. ISSN~0004-6256. Dostupné z: https://dx.doi.org/10.3847/1538-3881/ac58a0.
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